<style>
    * {
      margin: 0;
      padding: 0;
    }

    .left {
      width: 200px;
      height: 100vh;
      background-color: lightcoral;
      float: left;
    }

    .right {
      overflow: hidden;
      /* margin-left:200px; */
      height: 100vh;
      background-color: blueviolet;
    }
  </style>
</head>

<body>
  <div class="left"></div>
  <div class="right"></div>
</body>